In recent years, Natural Killer (NK) cells have garnered significant attention in the realm of neurodegenerative disease research, specifically in relation to Alzheimer’s disease, Parkinson’s disease, amyotrophic lateral sclerosis (ALS), and multiple sclerosis. These cells, part of the innate immune system, are known for their ability to detect and respond to infected, stressed, or abnormal cells, potentially influencing inflammatory responses by interacting with other immune cells. Despite the growing interest, researchers caution that the available clinical evidence is still in its infancy, and NK cell therapy is not yet established as a treatment for these conditions.
Initial human trials have begun exploring NK cells’ potential in treating Alzheimer’s disease. A Phase I clinical study conducted in 2025 evaluated the safety of expanded NK cells in 11 patients, with results recorded for 10 participants. This study, which involved administering intravenous infusions of an autologous, non-genetically modified expanded NK cell product every three weeks, prioritized safety assessments while also monitoring cognitive changes and cerebrospinal fluid biomarkers related to neuroinflammation, neurodegeneration, amyloid, and tau. Preliminary findings showed no adverse events linked to the NK cell product and noted changes in some cognitive functions and biomarkers, such as pTau181 and GFAP. However, larger and more extensive trials are necessary to determine any significant clinical benefits of NK cell therapy for Alzheimer’s.
Research into Parkinson’s disease has also highlighted the potential role of NK cells. A 2020 study published in the Proceedings of the National Academy of Sciences revealed that NK cells could interact with and break down alpha-synuclein aggregates in laboratory and animal models. The study also observed increased alpha-synuclein pathology and neuroinflammation when NK cells were depleted in a mouse model, suggesting that NK cells might regulate immune activity associated with Parkinson’s. Despite these findings, the evidence remains largely preclinical, and further research is needed to confirm whether NK cell therapy could be a viable treatment for humans.
The complexity of NK cells’ role in neurological diseases is becoming increasingly apparent. Different NK cell populations may have distinct functions, with their effects varying depending on the disease type, stage, and surrounding tissue environment. Consequently, simply increasing NK cell numbers may not necessarily yield beneficial outcomes. Researchers are examining which NK cell populations, activation states, doses, and treatment schedules might prove effective. Before NK cell therapies can be considered a standard treatment for neurodegenerative diseases, key questions need addressing, such as how effectively these cells influence the central nervous system, how long they remain active, and whether they can alter long-term disease progression.
As it stands, NK cell therapy is an investigational area of cellular medicine, with ongoing studies generating interest. However, more extensive clinical research is required to fully understand its effectiveness and long-term safety. Individuals considering such therapies should consult with qualified healthcare professionals and review available scientific evidence and safety information. This article serves educational and informational purposes and does not constitute medical advice or a treatment offer. NK cell therapy for neurodegenerative diseases remains under investigation and is not an established treatment for Alzheimer’s or Parkinson’s disease.
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